Enter your challenge name in the Challenge Name field (27-character limit).

Tap "Done."

Tap Duration and scroll to select a start date (tomorrow or any date thereafter).

Tap "Next."

Scroll to select an end date.

Tap "Done."

Tap "Select Friends." A list of your eligible Nike+ Friends who are also using the Nike+ Running App will appear. Select a friend by tapping the circle next to his/her name.

Tap "Done" when you are finished selecting friends. Be thorough! No additional invites can be sent once the Challenge has begun.

Your friends will now receive their invitations. They can accept any time before the challenge begins. Once the challenge begins, invitations can no longer be accepted.

The challenge will start on the designated start day at just after midnight in the challenge creator's time zone. Once the challenge has started, all synced Nike+ mileage counts, even if it's recorded on a different device. Mileage must be synced in order to count! The challenge will end at midnight on the designated end day in the challenge creator's time zone. At that point, all standings become final and no further mileage will count, even if it was recorded during the active challenge period.

Want more competition? Just tap the Rematch button to set up another challenge with the same invite list.

Nike+ Running App for Android (Mobile)

Get the current version of the Nike+ Running App installed on your Android device.

Enter your challenge name in the Challenge Name field (27-character limit).

Tap "Done."

Tap Duration and scroll to select a start date (tomorrow or any date thereafter).

Tap "Next."

Scroll to select an end date.

Tap "Done."

Tap "Select Friends." A list of your eligible Nike+ Friends who are also using the Nike+ Running App will appear. Select a friend by tapping the circle next to his/her name.

Tap "Done" when you are finished selecting friends. Be thorough! No additional invites can be sent once the Challenge has begun.

Your friends will now receive their invitations. They can accept any time before the challenge begins. Once the challenge begins, invitations can no longer be accepted.

The challenge will start on the designated start day at just after midnight in the challenge creator's time zone. Once the challenge has started, all synced Nike+ mileage counts, even if it's recorded on a different device. Mileage must be synced in order to count!The challenge will end at midnight on the designated end day in the challenge creator's time zone. At that point, all standings become final and no further mileage will count, even if it was recorded during the active challenge period.

Want more competition? Just tap the Rematch button to set up another challenge with the same invite list.